Rock-drill



(No Model.) V 2 Sheets-Sheet 1. T. F. FARRELL.

ROCK DRILL. No 479,356. Patented July 19, 1892.

INVENTOR WITNESSES:

ATTORNEYS (No Model.) 2 SheetsSheet 2.

T. F. FARRELL.

ROCK DRILL.

No. 479,356. Patented July 19, 1892.

WITNESSES: INVENTOR ATTORNEYS UNITED STATES I PATENT ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 479,356, dated July 19, 1892. Application filed January 11, 1892. Serial No. 417,631. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS FRANCIS FAR- RELL,a citizen of the United States, residing in Paterson, county of Passaic, and State of New Jersey, have invented certain new and useful Improvements in Rock-Drills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters and figures of reference marked thereon, which form a part of this specification.

The object of this invention is to provide a steam or air rock-drill simple and durable in construction, easily handled, and not liable to get out of order, and also reliable means for rotating the drill.

The invention consists in the improved rock-drill, its valve, and its tripod, and the combination and arrangement of the various parts thereof, substantially as will be hereinafter more fully described, and finally embodied in the clauses of the claims.

Referring to the accompanying drawings, in which like letters and figures of reference indicate corresponding parts in each of the several figures, Figure 1 is a longitudinal sectional view of the improved rock-drill removed from the tripod, but in connection with its mounting device. Fig. 2 is a front view of the tripod without the pipe-legs, the rear legholder being turned upward to fully illustrate its construction. Fig. 2 is a sectional view on line y, Fig. 2. Fig. 3 is a sectional view through the cylinder and its guide. Figs. 4 and 5 are enlarged detail views of the drillrot-ating bar and its locking device.

In said drawings, a represents a cylinder adapted to be moved up and down in guide or carriage b by means of screw 0. This guide or carriage is provided with a mounting-plate I), having a raised rounded portion or disk b adapted to fit on and in the corresponding portion d of shell 6, which latter consists of two parts, which are fastened together by bolts e 6 as clearly shown in Fig. 1. The bolt 6 extends through the mounting-plate b and guide I) and acts as a fulcrum for the said guide. By means of the said shell e the cyl inder a and its guide or carriage Z) is adjustably secured to the tripod f. The tripod f consists of the spindle g, provided at each end with a cap or cylinder h, which are held together by bolt o'. To each of said caps is secured or made integral therewith a ball-socket 7c, in which rests the ball-shaped end It of leg holder or socket 10 in which latter the pipe or extension leg is secured in the ordinary manner. The ball is provided with a recess 7.0 in which is pivotally secured by a pin 70 the lower rounded end of bolt is. The upper end of said bolt 7.4 passes through the top is of socket is, and by means of its nut 10 holds the ball 70 in its socket in any desired position. To the boltz' is also pivotally secured a yoke or fork m, carrying the third or rear leg-holder or leg-socket n, which preferably is made integral with the said yoke.

As I have now described the mounting device of cylinder to and its guide 1), their connection with the tripod, and the construction of the latter, I will now proceed to describe the construction of the cylinder and its respective drill and valve.

The cylinder at is provided at its lower end with cylinder-head 1 and stuffing-box 2 and at its upper with the cylinder-head 3, in which end is arranged the oil-hole 4. In said cylinderhead are also arranged two or more holes or sockets 5 5, in each of which rests a pin 7, pressing against spiral spring 6. The outer and rounded ends of said pins work or operate in recesses or teeth 9 in the flat surfaces of wheel 8, as shown in Figs. 1, at, and 5. Through the center of said wheel, and also through the tightening disk or plate 10, passes the upper end of drill-rotating bar 11, and rests with its flattened top 12 in a recess in cylinder-head 3, (opposite the oil-hole 4,) as clearly shown in Fig. 1. On said drill-rotating bar 11 and within the cylinder a operates the piston 12, provided at its lower end with the piston-rod l3 and drill-bit 14. The central portion of the said piston is also pro vided with a circular groove 15 and inclined shoulders 16 17, adapted to strike in the up or down motion of the piston alternately against the inclined ends 19 and 18 of the lower part 20 of the valve-lever 23. This part 20 is secured to rocker-shaft or pivot 21, the

latter having its hearings in the joint otthe cylinder and the valve-chamber, which are 5 fastened together by bolts or in any desired manner. In said valve-chamber is arranged the double piston-valve 24, provided at its center with a ball-socket 25, in which rests the ball-shaped end 22 of valve-lever 23, and the latter is also secured to rocker-shaft or pivot 21 in any desired manner.

In the top of the valve-chamber is arranged the steam-inlet 28 and at one side and in the center of said valve-chamber the exhaust 15 3l. From the valve-chamber the steam enters into the cylinder at through ports 29 and 30, Fig. 1.

In operation the cylinder is first adjusted on the tripod in the required position. Steam is then applied through inlet 28 into the valve-chamber, from where it enters through port 30 into the upper part of cylinder a. The steam presses now against disk and wheel 8, and thereby locks the drill-rotating bar 11 with its flattened end in the recess of cylinder-head 3 and prevents said bar from turning. The piston is then forced downward, and, as will be clearly seen and understood, can turn in one direction only. As soon as the inclined shoulder 17 of groove strikes against the incline 18 of the lower portion 20 of the valve-lever the piston-valve in the valve-chamber closes the port and opens the port 29, which latter allows the steam to enter the lower chamber of cylinder at. Thereby the piston 12 is forced upward, and simultaneously the exhaust steam in the upper part of the cylinder passes through opening or port 31. At the upward movement of the piston theinclined shoulder 16 strikes against incline 19 and forces the piston-valve back to its former position, in which the steam enters again the upper portion of the cylindera and the exhaust of the lower part of the said cylinder is free to escape. During the upward movement of the piston the rotating bar is free to turn with its wheel in one direction only, as the pins, acting on the teeth of said wheel, prevent its reversing.

I do not intend to limit myself to the exact construction shown and described, as various changes can be made without changing the scope of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. A rock-drill combining therein a cylinder, a cylinder-head secured to each end of said cylinder, a drill-carrying piston adapted to move up and down in said cylinder, adrillrotating bar provided at its top with a flattened portion adapted to rest in a corresponding recess on the inside of the upper cylinderhead, a wheel provided on its flattened sur- 65 face with teeth and arranged to rest partly againstthe under side of said flattened portion of the drill-rotating bar and also against the inside of the said upper cylinder-head, a locking plate or disk at the under side of said wheel and adapted to prevent the rotating bar from turning during the downward stroke of the piston, pins arranged in said cylinder-head and adapted to operate in the teeth of said wheel, and spiral springs controlling said pins, all said parts being arranged and adapted to operate substantially as described, and for the purposes set forth.

2. In a rock-drill-rotating device, the combination, with the cylinder, piston, and cylinder-heads, of a rotating bar, a flattened top made integral with said bar and adapted to rest in a corresponding recess in the cylinderhead, a wheel provided at its upper surface with teeth and resting against said flattened top and the said cylinder-head, pins arranged in said cylinder-head and acting as pawls for said toothed wheel, and a locking-disk arranged beyond said wheel andadapte d toforce the said wheel against the flattened top of the rotating bar and the cylinder-head during the downward motion of the piston, thereby preventing said bar from turning, substantially as described, and for the purposes set forth.

3. In a rock-drill, the combination, with the 95 cylinder and its guide, of a mounting-plate secured to said guide and provided with a circular projection b a spindle provided at each end with a cap and around the center part with a shell consisting of two parts, the upwe per one of which is provided with a flattened top, to which the mounting-plate of the guide is pivotally secured, a circular recess arranged in said flattened top and adapted to receive the circular portion b bolts holding r05 said shell parts together, one of them serving, also, as a fulcrum for the mounting-plate,abolt passing through said spindle and holding said caps and shells in place, a ball-socket arranged on each of said caps and made inteno gral therewith, a leg holder or socket provided at its upper end with a ball adapted to work in said ball-socket, a recess arranged in said ball, a bolt pivotally secured with its lower rounded portion in said recess and with r 15 its upper portion in said ball-socket, and a yoke provided with the third or rear legholder and pivotally secured to the spindle, all said parts being arranged and adapted to operate substantially as described, and for 120 the purposes set forth.

4. In a rock-drill, the combination, with the cylinder and the piston, of a groove provided in said piston, a valve-chamber secured to said cylinder, a double-headed cylindrical 12 5 piston-valve arranged in said valve-chamber,

a valve-lever 23, pivotally secured in the joint of the cylinder and the said valve-chamber, and provided at its lower part 20 with inclines l8 and 19, a ball 22, arranged at the 1 c upper end of valve-lever 23, andaball-soeket In testimony that I claim the foregoing I arranged in the connecting-stem of the said have hereunto set my hand this 2d day of double-headed piston-valve and adapted to January, 1892.

engage with said ball 22, said valve-lever be- THOMAS FRANCIS FARRELL. 5 ing adapted to be operated by the groove in Witnesses:

the piston of the cylinder, substantially as ALFRED GARTNER,

described, and for the purposes set forth. ALFRED A. VAN HOVENBERG. 

